Enhanced luminescence intensity and color purity of the red emitting LnVO4:Eu3+@ SiO2 (Ln = Gd, Y and Gd/Y) powder phosphors

An attempt was made to enhance the luminescence properties of LnVO4:Eu3+@ SiO2 (Ln = Gd, Y and Gd/Y) powder phosphors. Pure phase with tetragonal structure of the produced phosphors was confirmed by XRD profiles. Sub-micron sized phosphors have shown 35% more PL intensity than the bulk, which was further improved 20.22% with SiO2 shell coating. SiO2 shell coating was optimized by SEM-EDAX, FT-IR, PL and TEM measurements. Emission intensities of the transition, 5D0 → 7F2 have dominated 5D0 → 7F1, which indicated the lowering of an inverse symmetry in the vicinity of Eu3+ ions. Luminescence intensity and color purity were enhanced with the host modification by substituting Gd3+ with Y3+ sites, followed by SiO2 coating. Based on the systematic investigations carried out, the phosphor Y0.95VO4:Eu3+0.05@ SiO2 is suggested to be a novel contender for its suitable red emission in certain displays or lighting.

Figure optionsDownload as PowerPoint slideHighlights
► Tetragonal phase lanthanide vanadates doped with Eu3+ were synthesized.
► Luminescence enhancement was done by optimizing the host (Gd,Y) and SiO2 coatings.
► SiO2 coating was characterized by SEM-EDAX, FT-IR and PL techniques.
► 5D0 → 7F2 domination over 5D0 → 7F1 indicates the absence of an inversion symmetry.
► Y0.95VO4:Eu3+@ SiO2(10 vol.%) is found to be a novel enhanced red emitting phosphor.